Development of technique for determining of stamping hammer blow efficiency

2021 ◽  
pp. 491-498
Author(s):  
A.M. Zolotov ◽  
M.O. Smirnov
Keyword(s):  
Mathematical Modelling ◽  
Turbine Blade ◽  
Technological Process ◽  
Stamping Process ◽  
Die Forging ◽  
Stage Process ◽  
Force Displacement ◽  
Hammer Blow

The multiple-stage process of large-sized turbine blade blanks on steam-air die-forging hammer is considered. Mathematical modelling of the stamping process of large-sized turbine blade on falling parts 25 t mass stamping hammer is carried out. Measurements of the number of hammer blows and the under-stamping of blade blanks at each stage of the technological process are performed. Method for determining of the hammer blow efficiency is developed. Diagram of the force—displacement of falling parts 25 t mass hammer is constructed. The dependence of the blow efficiency of falling parts 25 t mass hammer is obtained, with can be used in mathematical modelling of the stamping processes of large-sized forgings on this hammer.

Repair of a Gas Turbine Blade Tip by Impulse Laser Build-Up Welding

2014 ◽  
Vol 682 ◽  
pp. 96-99 ◽  
Author(s):  
I.L. Shitarev ◽  
V.G. Smelov ◽  
A.V. Sotov
Keyword(s):  
Gas Turbine ◽  
Turbine Blade ◽  
Technological Process ◽  
Optimization Algorithm ◽  
Repair Process ◽  
Gas Turbine Blade ◽  
Blade Tip

This article deals with the repair process of a gas turbine blade tip by impulse laser build-up welding, optimization algorithm for the technological process is proposed and macro-and micrograph of the investigated surface was made.

A mathematical modelling and experimental study of annular-radial type magnetorheological damper

2021 ◽  
pp. 1-18
Author(s):  
Elliza Tri Maharani ◽  
U. Ubaidillah ◽  
Fitrian Imaduddin ◽  
K.M. Wibowo ◽  
Dewi Utami ◽  
...  
Keyword(s):  
Experimental Study ◽  
Mathematical Modelling ◽  
Magnetorheological Damper ◽  
Test Machine ◽  
Damping Force ◽  
Passive Damper ◽  
Significant Difference ◽  
Force Velocity ◽  
Active Damper ◽  
Force Displacement

An experimental study was undertaken to evaluate the mathematical modelling of the magnetorheological (MR) damper featuring annular radial gap on its valve. The experiment was conducted using a fatigue dynamic test machine under particular excitation frequency and amplitude to get force-velocity and force-displament characteristics. Meanwhile, the mathematical modelling was done using quasi-steady modelling approach. Simulation using adaptive neuro fuzzy inference (ANFIS) Algorithm (Gaussian and Generalized Bell) were also carried out to portray the damping force-displacement modelling that is used to compare with the experimental results. The experimental characteristics show that amplitudes excitation and current input affect the result damping force value. The comparison of the experimental and mathematical results presented in this paper shows a significant difference in damping force value and that the quasi-steady modelling could not significantly approach the damping force-velocity results. Moreover, the semi-active damper is compared to the passive damper. The results show that a semi-active damper performs better than a passive damper because it only requires a little power. Based on the damping force-displacement modelling, it can be seen that Gaussian has a higher accuracy rather than Generalized Bell. Discussion on the energy dissipation and equivalent damping coefficient were also accomodated in this paper. Having completed in mathematical modelling and simulation, the damper would be ready for further work in-vehicle application that is development of control system.

scholarly journals THE ROLE OF MATHEMATICAL MODELLING OF PRODUCTION PROBLEMS IN SPECIALIZED SCHOOL

2021 ◽  
Author(s):  
Smagulov E. Zh. ◽  
Mendigaliyeva G. Kh. ◽  
Smagulov B. E.
Keyword(s):  
Mathematical Modeling ◽  
Information Technology ◽  
Mathematical Modelling ◽  
Technological Process ◽  
Educational Environment ◽  
International Standards ◽  
Specialized School ◽  
Definition Of ◽  
Production Problems

The article discusses the main directions of the development of the educational environment and the role of mathematical modeling of production problems in a specialized school. The key issue of the modernization of education is described - this is improving its quality, bringing it in line with international standards. The emphasis is not on the knowledge gained, but rather on the process of applying this knowledge. The definition of the concept of pedagogical technology is given - this is information technology, since the basis of the technological process of training is the receipt and transformation of information.

scholarly journals Mathematical modelling of the within-host dynamics of Plasmodium falciparum

Parasitology ◽  
2000 ◽  
Vol 121 (3) ◽  
pp. 227-235 ◽  
Author(s):  
M. B. HOSHEN ◽  
R. HEINRICH ◽  
W. D. STEIN ◽  
H. GINSBURG
Keyword(s):  
Mathematical Model ◽  
Immune Response ◽  
Plasmodium Falciparum ◽  
Mathematical Modelling ◽  
Exponential Growth ◽  
Clinical Observations ◽  
Multi Stage ◽  
Inherent Feature ◽  
Stage Process ◽  
The Subject

The development of malaria due to Plasmodium falciparum is a complex, multi-stage process. It is usually characterized by an exponential growth in the number of parasite-infected erythrocytes, followed by marked oscillations in this number with a period of 48 h, which are eventually dampened. This course of events has been the subject of various mathematical models. In this paper we propose a new mathematical model for the in-host asexual erythrocytic development of P. falciparum malaria. Synchronicity of the infection is shown to be an inherent feature of infection, irrespective of the duration of merozoite release from the liver. It will, therefore, cause periodic symptoms, as known in malaria patients. We also simulate the effects of an induced host immune response and show how the level of immunity affects the development of disease. The simulations fit well with the clinical observations. We show how infection can become asynchronous and discuss the effect of desynchronization on the circulating and total parasitaemia and demonstrate that synchronized broods will show parasitaemia fluctuations.

Closed Die Forging of Turbine Blades

2010 ◽  
Author(s):  
Somer M. Nacy ◽  
Alaa H. Ali
Keyword(s):  
Experimental Investigation ◽  
Finite Element ◽  
Turbine Blade ◽  
High Purity ◽  
Turbine Blades ◽  
Theoretical Part ◽  
Die Forging ◽  
Closed Die Forging ◽  
Finite Element Package ◽  
Line Angle

This paper comprises a theoretical and experimental investigation dealing with the simulation of closed die forging of turbine blades. The theoretical part was achieved numerically via the well known finite element package (ANSYS). For simulation purposes, the material used for blade manufacture was high purity lead (99.99%), which was pressed between two dies with the required shape of the turbine blade. An optimum flash-less die shape was obtained with a parting line angle of 16°.

Numerical Simulation and Analysis of High-Strength Steel Autobody Panel Stamping

2011 ◽  
Vol 328-330 ◽  
pp. 730-733
Author(s):  
Dong Xu Zhao ◽  
Yu Jia Tang ◽  
Zhi Hao Pei
Keyword(s):  
Numerical Simulation ◽  
Yield Strength ◽  
High Strength Steel ◽  
Strain Path ◽  
High Strength ◽  
Effective Solution ◽  
Stamping Process ◽  
Multi Stage ◽  
Stage Process

The high-strength steel blanks with higher yield strength had introduced many challenging formability problems for the stamping process. However, in some situations the multi-stage process is a very effective solution for the stamping of high-strength blanks with a relatively lower formability than that of commonly steel blanks. In the multi-stage process, the change of strain path will be beneficial to the reduction of strain peaks and the utilization of the potential plasticity.

scholarly journals Mathematical Modelling of Process of Shaping of Sand-Pitch Mixes

2019 ◽  
pp. 810-817
Author(s):  
Vitaliy Yu. Kulikov ◽  
Evgeniy N. Eremin ◽  
Tatyana V. Kovalyova ◽  
Elena P. Scherbakova
Keyword(s):  
Mathematical Modelling ◽  
Technological Process ◽  
Static Loading ◽  
Gas Permeability ◽  
State Density ◽  
Technological Parameters ◽  
Different Types ◽  
Deformed State

This article considers mathematical dependences of properties of a casting mold on various parameters of her shaping. The competitiveness in production of castings depends on durability, reliability of the made details, ability to meet requirements and expectations of the consumer of production. Technological process of receiving castings most widespread now in the sandyargillaceous forms (SAF) not completely meets the modern requirements as it is characterized by different types of marriage: gas porosity, scorch, shrinkable sinks, blockages, hot and cold cracks, and others. The bigger quality of castings gives casting in the sand-pitch forms (SPF) in which the high gas permeability and durability are combined, they don’t resist shrinkage, don’t absorb moisture the stiffening alloy and aren’t inclined to an fallibility. However, one of shortcomings of this way of casting is rather high cost binding. One of the directions of decrease in an expense binding is use along with heating of mix for shaping of a cover and static loading. Other direction of decrease in a consumption of mix in general, and binding in particular, is determination of dependence of properties of a shell form on technological parameters that will promote management of properties of a form, decrease in marriage, etc. Formulas of the intense deformed state, density, amounts of heat of the sand-pitch form made at the same time in the conditions of heating and static loading are presented

scholarly journals The Evaluation and Quantification of the Impact Generated upon the Environment by a Thermo Electrical Plant

1970 ◽  
Vol 66 (2) ◽  
Author(s):  
Gilda-Diana BUZATU ◽  
Ion PETRIŞOR
Keyword(s):  
Experimental Data ◽  
Mathematical Modelling ◽  
Technological Process ◽  
Pollution Source ◽  
Gaseous Pollutants ◽  
National Environment ◽  
Topographical Factors ◽  
General Aspects ◽  
The Impact ◽  
Pollutants Dispersion

The paper presents general aspects regarding the impact that the activities of producing electrical and thermic energy at S.E. Craiova II, have upon the environment. It was taken into consideration only the pollution caused by the evacuation of the emissions of solid and gaseous pollutants contained in the burning gasses. The burning gasses resulted from the technological process are evacuated in the atmosphere through different installations such as gas canals, burning gasses ventilators and dispersion stacks. The main purpose of the dispersions stacks is to ensure the dispersion and to maintain the pollutants level in the limits of the admitted values. For establishing the model of transport and dispersion of pollutants in atmosphere, there were taken into account the meteorological, topographical factors and also those factors that are related with the pollution source. The results, presented as pollutions maps, were obtained through processing, interpretation and by comparing the experimental data from year 2007 with the European and national environment standards and normative. The mathematical modelling of pollutants dispersion revealed a small level of imissions, and that is mainly because of the height of the burning gasses emissions stacks.

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